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#41
Well it is beyond my grasp (at the moment) but I see, for example, that my PCI express only has a 256MB MMIO mapping though the graphics card is 512MB. It looks to me that aPCI express bus is limited to 256MB. I expect this is similar to the AGP graphics aperture. It is very complicated now as the mainboard chipsets now include graphics management controllers and abstractions.
So my original assessment of Max chipset address range - graphics memory should be max chipset range - video aperture - (other MMIO mapped memory like PCI bus).
- Gene
Last edited by GeneO; 31 Oct 2010 at 19:59.